The Psychic (Sette note in nero; Murder to the Tune of Seven Black Notes; Seven Notes in Black) (1977) [Virginia Ducci]: Possibly bludgeoned to death with a poker by Gianni Garko, who then seals her up inside the wall. The movie ends with Marc Porel hearing Jennifer's watch through the wall, leaving it ambiguous as to whether her injury was fatal or whether she's rescued in time; I'm listing it just in case.

Full Exposure: The Sex Tape Scandal(1989) [Debralee Taft]: Shot to death by Anthony James Denison from downstairs, while Jennifer is on the balcony trying to shoot Lisa Hartman; she then falls over the railing. (Thanks to Energman)

Bad Love (Love Is Like That; Wild Angel) (1993) [Mrs. Alman]: Chokes to death on her gag after being tied up and gagged by Tom Sizemore during a robbery, while the also-bound-and-gagged Pamela Gidley looks on helplessly.